crwdns2934241:0crwdne2934241:0 michellemseymour

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Where to get Koss ESP6 stereophones restored

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I inherited my dad's old headphones - they are Koss ESP6 electrostatic stereophones, vintage 1968! And wow are they heavy. There's a bunch of adapters in the case but I can't get the headphones to work. Would you know how I can go about getting them restored/refurbished?

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Koss Porta Pro

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open